当我试图取消模式时，iOS崩溃

我使用模态转换动画对控制器进行模态化。但是当我试图关闭控制器时，程序崩溃了。Xcode没有记录任何消息

我的过渡动画有问题。当我删除转换代码时，它运行良好

那么我的代码怎么了

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
    _transitionContext = transitionContext;
    UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];
    UIView *fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];
    CALayer *toVcLayer = [CALayer layer];
    toVcLayer.frame = toView.layer.frame;
    [toVcLayer addSublayer:toView.layer];

    _transformLayer = [CATransformLayer layer];
    _transformLayer.frame = [UIScreen mainScreen].bounds;
    [_transformLayer addSublayer:fromView.layer];
    CATransform3D ct = CATransform3DIdentity;
    ct = CATransform3DMakeTranslation(0.0, 0.0, -1.0);
    ct = CATransform3DRotate(ct, M_PI, 0.0, 1.0, 0.0);
    toVcLayer.transform = ct;
    [_transformLayer addSublayer:toVcLayer];

    CATransform3D at = CATransform3DIdentity;
    at = CATransform3DRotate(at, M_PI, 0.0, 1.0, 0.0);
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
    animation.toValue = [NSValue valueWithCATransform3D:at];
    animation.duration = 1.0;
    animation.delegate = self;
    [_transformLayer addAnimation:animation forKey:nil];

    [transitionContext.containerView.layer addSublayer:_transformLayer];
}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
    [_transitionContext.containerView addSubview:[_transitionContext viewForKey:UITransitionContextToViewKey]];
    [_transitionContext completeTransition:YES];
}

-（void）animateTransfion:（id）transitionContext{
_transitionContext=transitionContext；
UIView*toView=[transitionContext viewForKey:UITransitionContextToViewKey]；
UIView*fromView=[transitionContext viewForKey:UITransitionContextFromViewKey]；
CALayer*toVcLayer=[CALayer层]；
toVcLayer.frame=toView.layer.frame；
[toVcLayer addSublayer:toView.layer]；
_transformLayer=[CATTransformLayer层]；
_transformLayer.frame=[UIScreen mainScreen].bounds；
[\u transformLayer addSublayer:fromView.layer]；
CATTransformM3D ct=CATTransformM3D实体；
ct=CATTransformM3dMakeTransformation（0.0,0.0，-1.0）；
ct=ct，M_-PI，0.0,1.0,0.0；
toVcLayer.transform=ct；
[_transformlayeraddsublayer:toVcLayer]；
CATTransformM3D at=CATTransformM3D实体；
at=CATTransportorm3drotate（at，M_PI，0.0,1.0,0.0）；
CABasicAnimation*动画=[CABasicAnimation animationWithKeyPath:@“transform”]；
animation.toValue=[NSValue ValueWithCatTransformM3d:at]；
animation.duration=1.0；
animation.delegate=self；
[_transformlayeraddanimation:animation forKey:nil]；
[transitionContext.containerView.layer addSublayer:_transformLayer]；
}
-（void）animationDidStop:（CAAnimation*）anim finished:（BOOL）标志{
[\u transitionContext.containerView添加子视图：[\u transitionContext viewForKey:UITransitionContextToViewKey]]；
[_TransitionContextCompleteTransition:是]；
}

问题可能在于在其他层之间移动层。您正在尝试在其他地方插入已具有超图层的图层。我不知道为什么它在演示时还没有崩溃，但它在演示时崩溃也就不足为奇了

解除视图控制器时，它们的状态不同。主要地，

toView

已经是

containerView

的子视图。毕竟，在演示时，它是

fromView

。代码视图/层层次结构变得非常混乱，最终导致崩溃

解决方案非常简单。而不是创建单独的

transformLayer

，以保存其他层并设置动画。分别设置每个层的动画。例如：

-(void)animateTransition(id<UIViewControllerContextTransitioning>)transitionContext {
    _transitionContext = transitionContext;
    UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];
    UIView *fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];

    if (toView.superview == nil)
        [transitionContext.containerView addSubview:toView];

    const NSTimeInterval duration = 1.0;
    const CGFloat translationX = 400.0;

    toView.layer.transform = CATransform3DMakeTranslation(translationX, 0.0, 0.0);

    CABasicAnimation *toAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
    toAnimation.toValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];
    toAnimation.duration = duration;
    toAnimation.delegate = self;

    CABasicAnimation *fromAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
    fromAnimation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeTranslation(-translationX, 0.0, 0.0];
    fromAnimation.duration = duration;

    [fromView addAnimation:fromAnimation forKey:nil];
    [toView addAnimation:toAnimation forKey:nil];
}

-(void)animationDidStop:(CAAnimation*)anim finished:(BOOL)flag {
    [_transitionContext completeTransition:YES];
}

-（无效）动画转换（id）转换上下文{
_transitionContext=transitionContext；
UIView*toView=[transitionContext viewForKey:UITransitionContextToViewKey]；
UIView*fromView=[transitionContext viewForKey:UITransitionContextFromViewKey]；
if（toView.superview==nil）
[transitionContext.containerView添加子视图：toView]；
const NSTimeInterval持续时间=1.0；
常数CGFloat translationX=400.0；
toView.layer.transform=CATTransferorM3DMAKETRANSFORM（translationX，0.0，0.0）；
CABasicAnimation*toAnimation=[CABasicAnimation animationWithKeyPath:@“transform”]；
toAnimation.toValue=[NSValue ValueWithCatTransformM3d:CatTransformM3DidEntity]；
toAnimation.duration=持续时间；
toAnimation.delegate=self；
CABasicAnimation*fromAnimation=[CABasicAnimation animationWithKeyPath:@“transform”]；
fromAnimation.toValue=[NSValue ValueWithCatTransformM3d:CatTransformM3DmakeTranslation（-translationX，0.0，0.0]；
fromaniation.duration=持续时间；
[fromView addAnimation:fromAnimation-forKey:nil]；
[toView addAnimation:toAnimation-forKey:nil]；
}
-（void）animationDidStop:（CAAnimation*）anim finished:（BOOL）标志{
[_TransitionContextCompleteTransition:是]；
}

问题可能在于在其他层之间移动层。您试图在其他地方插入已经有超层的层。我不知道为什么它在演示时还没有崩溃，但它在演示时会崩溃也就不足为奇了

解除视图控制器时，它们的状态不同。主要是，

toView

已经是

containerView

的子视图。毕竟，在显示时是

fromView

。由于代码视图/层层次结构变得非常混乱，最终导致崩溃

解决方案非常简单。不要创建单独的

transformLayer

，以保存其他层并设置动画。分别设置每个层的动画。示例：

-(void)animateTransition(id<UIViewControllerContextTransitioning>)transitionContext {
    _transitionContext = transitionContext;
    UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];
    UIView *fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];

    if (toView.superview == nil)
        [transitionContext.containerView addSubview:toView];

    const NSTimeInterval duration = 1.0;
    const CGFloat translationX = 400.0;

    toView.layer.transform = CATransform3DMakeTranslation(translationX, 0.0, 0.0);

    CABasicAnimation *toAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
    toAnimation.toValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];
    toAnimation.duration = duration;
    toAnimation.delegate = self;

    CABasicAnimation *fromAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];
    fromAnimation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeTranslation(-translationX, 0.0, 0.0];
    fromAnimation.duration = duration;

    [fromView addAnimation:fromAnimation forKey:nil];
    [toView addAnimation:toAnimation forKey:nil];
}

-(void)animationDidStop:(CAAnimation*)anim finished:(BOOL)flag {
    [_transitionContext completeTransition:YES];
}

-（无效）动画转换（id）转换上下文{
_transitionContext=transitionContext；
UIView*toView=[transitionContext viewForKey:UITransitionContextToViewKey]；
UIView*fromView=[transitionContext viewForKey:UITransitionContextFromViewKey]；
if（toView.superview==nil）
[transitionContext.containerView添加子视图：toView]；
const NSTimeInterval持续时间=1.0；
常数CGFloat translationX=400.0；
toView.layer.transform=CATTransferorM3DMAKETRANSFORM（translationX，0.0，0.0）；
CABasicAnimation*toAnimation=[CABasicAnimation animationWithKeyPath:@“transform”]；
toAnimation.toValue=[NSValue ValueWithCatTransformM3d:CatTransformM3DidEntity]；
toAnimation.duration=持续时间；
toAnimation.delegate=self；
CABasicAnimation*fromAnimation=[CABasicAnimation animationWithKeyPath:@“transform”]；
fromAnimation.toValue=[NSValue ValueWithCatTransformM3d:CatTransformM3DmakeTranslation（-translationX，0.0，0.0]；
fromaniation.duration=持续时间；
[fromView addAnimation:fromAnimation-forKey:nil]；
[toView addAnimation:toAnimation-forKey:nil]；
}
-（void）animationDidStop:（CAAnimation*）anim finished:（BOOL）标志{
[_TransitionContextCompleteTransition:是]；
}

谢谢！我对这个问题困惑了很长时间。谢谢！我对这个问题困惑了很长时间。